Clonal selection is an explanation for how _____
A) a single type of stem cell can produce both red blood cells and white blood cells
B) V, J, and C gene segments are rearranged
C) an antigen can provoke production of high levels of specific antibodies
D) HIV (human immunodeficiency virus) can disrupt the immune system
E) macrophages can recognize specific T cells and B cells
Answer: C
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The research of which of the following scientists showed that genetic disorders and abnormal
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All of the following characteristics of tRNA molecules are true except::
a. They are recognized by ribosomes. b. They have an anticodon. c. They have an attachment site for an amino acid. d. They are recognized by a specific aminoacyl-tRNA synthetase. e. They are considerably larger than rRNA molecules.
Copper is an example of a(n) major mineral. Indicate whether the statement is true or false
Which of the following is NOT correct regarding DNA and RNA synthesis in cells?
A) Nucleotide triphosphates are the substrates for DNA or RNA synthesis. B) The template strand is antiparallel to the newly synthesized strand. C) The overall direction of chain growth is from the 5' to 3' end. D) DNA is the template for both DNA and RNA synthesis. E) Both processes require an RNA primer to begin.